S: (n) matter (that which has mass and occupies space) "physicists study both the nature of matter and the forces which govern it"
S: (n) process, physical process (a sustained phenomenon or one marked by gradual changes through a series of states) "events now in process"; "the process of calcification begins later for boys than for girls"
S: (n) substance (material of a particular kind or constitution) "the immune response recognizes invading substances"
S: (n) device (an instrumentality invented for a particular purpose) "the device is small enough to wear on your wrist"; "a device intended to conserve water"
S: (n) heat-seeking missile (a missile with a guidance system that directs it toward targets emitting infrared radiation (as the emissions of a jet engine))
S: (n) missile (a rocket carrying a warhead of conventional or nuclear explosives; may be ballistic or directed by remote control)
S: (n) device (an instrumentality invented for a particular purpose) "the device is small enough to wear on your wrist"; "a device intended to conserve water"